Update Android.bp to reflect aosp/2763825

Test: Ran cargo2android. Treehugger.
Change-Id: Ic4101aaf0ee2aec8ad932189c5dc5c7ba634c1cb
diff --git a/Android.bp b/Android.bp
index cce8c92..067bed1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -29,8 +29,6 @@
     ],
     proc_macros: ["libpest_derive"],
     compile_multilib: "first",
-    product_available: true,
-    vendor_available: true,
 }
 
 rust_library_host {
@@ -58,8 +56,6 @@
     ],
     proc_macros: ["libpest_derive"],
     compile_multilib: "first",
-    product_available: true,
-    vendor_available: true,
 }
 
 rust_binary_host {
@@ -88,8 +84,6 @@
     ],
     proc_macros: ["libpest_derive"],
     compile_multilib: "first",
-    product_available: true,
-    vendor_available: true,
 }
 
 // Defaults for rust backend generation.